44 AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B
Caldos25: Preparation for installation
Installation site
Ambient temperature
During operation with analyzer module installed in a system housing
+5 to +45 °C without electronics module
+5 to +45 °C with electronics module or with power supply only
Vibrations/shocks
max. ±0.04 mm at 5 to 30 Hz
Sample gas
Sample gas inlet conditions
Temperature The dew point of the sample gas must be at least 5 °C
lower than the lowest ambient temperature in the overall
sample gas path. Otherwise, a sample gas cooler or con-
densate trap is required.
When there is a direct sample chamber connection the
maximum sample gas dew point is 55 °C.
Fluctuations in water vapor content cause volume errors.
Pressure The analyzer module is operated under atmospheric pres-
sure; the sample gas outlet is open to atmosphere. Inter-
nal pressure drop < 5 hPa with standard flow rate 60 l/h.
Permissible absolute pressure range: 800 to 1250 hPa.
Operation under lower absolute pressure (e.g. at altitudes
above 2000 m) on request. Overpressure in the sample
chamber max. 100 hPa.
Flow 10 to 90 l/h, max. 90 to 200 l/h for option T90 < 6 s
Remark: Sample gas temperature, pressure and flow rate should be main-
tained constant to such a degree that the fluctuation influence on the accu-
racy of measurement is acceptable (see also chapter "Analyzer module oper-
ating data" (see page 346)).
Flammable gases
The analyzer module is suitable for the measurement of flammable gases
and vapors under atmospheric conditions (p
abs
≤ 1.1 bar, oxygen content
≤ 21 vol.%). Temperature class: T4.
The sample gas may not be potentially explosive in normal operation; if it is
potentially explosive in the event of faults in the sample gas supply, then
only rarely and for a short time (corresponding to Zone 2).
Pressure in the sample gas path in normal operation p
e
≤ 100 hPa; in the
event of faults in the sample gas supply, the pressure may not exceed the
maximum value of p
e
= 500 hPa.
A housing purge with nitrogen must be provided for the measurement of
flammable gases and vapors. Flame barriers can be used as an option (with
the exception of the 'Safety Concept' version (see page 20)). Pressure drop
at the flame barriers approx. 40 hPa with a sample gas flow rate of 50 l/h.
Material of the flame barriers: Stainless steel 1.4571.
Prior to using the analyzer module, the corrosion resistance of the sample
gas must be tested.
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